Why can't I move on from a past relationship despite my mistakes?

Feeling so lost and overwhelmed. My ocd has been focused on my boyfriend for the past year. We had a rough patch and he made some new friends at work. I then became obsessed he fancied one of them and went through all his messages and obsessively questioned him. He has stood by the fact he didn’t like her like that and other people who speak to him about it think he didn’t. He’s spoken to my therapist and tried to help, but I just can’t get it in my head he’s not lying. The things I believe to be ‘evidence may aren’t really telling. I found out they were still chatting on insta once she left his company but the convo was fairly platonic - they were just talking about work and the new people. She did make a comment it would be more fun if I was still there, but she is french so there is a slight language barrier (I thought this sounded flirty). She also messaged him about a festival she was at with her boyfriend. He said they are very in love and moved in together and from her social media they seem that way. I also once came home and picked up his phone and it opened onto a video of her he’d been watching which he’d filmed of her falling asleep in the office. He said he’d just been flicking through his videos but I became obsessed he was really missing her. All my family and friends think he’s telling the truth. He’s taken me to doctors appointments and keeps telling me the power is in my hands. I told him the other day I’ve spent the past year imagining the things I believe to be true and negatively reinforcing it and said it’s hard to unlearn. He was upset by this and said why have you done that when I’m not lying. He said that if what he’s told me isn’t enough that’s okay. Maybe I can’t get over the fact he had this friend and I can’t trust what he said. Prior to this we’d been together happily for 5 years. He’s now said we’ve spent a year unhappy, me not trusting him and breaking down. He said he wants to really move on with life, start saving for a house etc and has asked me to draw a line under this. He’s broken up with me 3 times in the past to give me a wake up call that he cannot take the questioning and yet I still feel I don’t believe him. I was cheated on in the past and I think that’s really traumatised me. I don’t want my ocd to force me to leave him. It’s seems so unfair, had I not had ocd I wouldn’t have viewed it like this. But maybe I can’t get over it - even though nothing has happened. I feel so bad for putting him through this and so bad I’m not helping myself either. Just want some kind words. Has anyone else ever had their ocd stop them from being able to see things clearly or how other people do?

18+ I was such a horrible boyfriend. I was friendly and flirty with other girls and I would always justify it by saying that I wasn’t cheating (which I never did). I also got super drunk during a family vacation and I don’t remember anything but I fear i may have kissed someone, even though my family has to me that I didn’t because they were with me 99% of the time. I realize however that it doesn’t take a physical act to hurt your partner. Flirting is just as bad. I don’t know why I was that way. I was always an attention seeking idiot. My guilty conscience led me to develop OCD. Now all I do is obsess over every day of my life trying to figure out if I did anything wrong so I can confess it to my partner. I wonder if I’ll ever be enough for her again. I feel so unworthy of her love. She is hurting so much and I can’t believe I caused her that pain. She tells me to let it go but I feel like she deserves to know who I was. She says she forgives me because I am no longer that person but I can fucking forgive myself. I’ve tried meditating and doing affirmations but it’s been months and I feel like I am tainted forever. I led her to believe that I was someone that I wasn’t. I told her I only had eyes for her but I still found other girls attractive and watched porn behind her back. I don’t know what to do. I don’t eat or sleep or do anything but be in my bed crying. I love her so much and I can’t believe I was such a piece of shit. I want to move forward but I don’t know how to. We’ve been together for over 5 years and I can’t believe I am just now realizing all this. I wonder if it’s too late. I’ve been an atheist for years and I’m even praying out of desperation. I hate myself

Does anyone have any tips for a breakup when you also had/have ROCD? Just found out a few days ago that my partner of 8.5 years was having an affair and he doesn't want to be with me anymore. My heart is completely broken. I had spent the last year healing from ROCD and had genuinely got back to a place where I felt more certain again and back in love but now I have no idea where all of that fits in my life now. He also blames me hurting him as one of the reasons he cheated which is so unfair. I know I hurt him because I did confess all my thoughts to him before I knew what ROCD was, but since learning about it and healing from it I tried so many times to share that it wasn't ever actually about him but he never really understood. He never asked me about this side of my mental health, he just maybe wasn't interested and I'm so angry and upset about that.